1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
|
fn fn_once() -> _ {
//~^ ERROR the placeholder `_` is not allowed within types on item signatures for return types [E0121]
//~| NOTE not allowed in type signatures
//~| HELP replace with an appropriate return type
//~| SUGGESTION impl FnOnce()
//~| NOTE for more information on `Fn` traits and closure types
let x = String::new();
|| {
drop(x);
}
}
fn fn_mut() -> _ {
//~^ ERROR the placeholder `_` is not allowed within types on item signatures for return types [E0121]
//~| NOTE not allowed in type signatures
//~| HELP replace with an appropriate return type
//~| SUGGESTION impl FnMut(char)
//~| NOTE for more information on `Fn` traits and closure types
let x = String::new();
|c| {
x.push(c);
}
}
fn fun() -> _ {
//~^ ERROR the placeholder `_` is not allowed within types on item signatures for return types [E0121]
//~| NOTE not allowed in type signatures
//~| HELP replace with an appropriate return type
//~| SUGGESTION impl Fn() -> i32
//~| NOTE for more information on `Fn` traits and closure types
|| 1i32
}
fn main() {}
|
